<!DOCTYPE html>
<html>
<head>
	<title></title>
	<link rel="stylesheet" href="./box1.css">
	<style type="text/css">
		.container{
			background-color: #ccc;
			height: 1000px;
		}
		.box1{
			height: 50px;
			background-color: red;
		}
	</style>
</head>
<body>
<div class="container">
	<div class="row">
		<div class="col-lg-6 col-md-6 box1">
			<div class="row">
				<div class="col-lg-6 col-md-6 box1"></div>
				<div class="col-lg-3 col-lg-offset-3 col-md-6 box1"></div>
			</div>
		</div>
		<div class="col-lg-3 col-lg-offset-3 col-md-3 col-md-offset-3 box1"></div>
	</div>
</div>
</body>
</html>